We wrap up our look at the 5 Cs of Arizona's economy with an examination of copper. The state is dotted with towns that at some point relied on mineral extraction for jobs. And that industry's historical practices around water use have reflected the state's feelings about both natural resources, whether it's dropping slag into rivers in the early-to-mid 1900s or efforts to squeeze and treat every drop of water out of today's tailings. How does this stalwart of Arizona's economy compare to others when it comes to water use?